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Fano mechanism of the giant magnetoresistance formation in a spin nanostructure arXiv: 1109.0391 vl. - / Val'kov V.V., Aksenov S.V. - [Б. м. : б. и.]. - Б. ц.

Доп.точки доступа:
Val'kov, V.V.; Aksenov, S.V.}
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Oreshonkov, A. S.
Phonon dynamics in MoSi2N4: insights from DFT calculations / A. S. Oreshonkov, E. V. Sukhanova, Z. I. Popov // Phys. Chem. Chem. Phys. - 2023. - Vol. 25, Is. 43. - P. 29831-29841, DOI 10.1039/D3CP02921B. - Cited References: 74. - The authors acknowledge financial support from Russian Science Foundation (project №21-73-20183, https://rscf.ru/project/21-73-20183/) . - ISSN 1463-9076. - ISSN 1463-9084
Кл.слова (ненормированные):
monolayer -- bulk -- Raman spectrum -- nanostructure -- stability
Аннотация: We have reported the density functional theory investigations on the monolayer, 2 layered and bulk MoSi2N4 in three structural modifications called as α1 [Science, DOI: 10.1126/science.abb7023], α2 and α3 [Adv. Funct. Mater., DOI: 10.1002/adfm.202214050]. We showed that in the case of monolayers the difference in total energies is less than 0.1 eV between α1 and α3 phases, and less than 0.2 eV between α1 and α2 geometries. The most energetically favorable layer stacking for the bulk structures of each phase was investigated. All considered modifications are dynamically stable from a single layer to a bulk structure in energetically favorable stacking. Raman spectra for the monolayer, 2 layered and bulk structures were simulated and the vibrational analysis was performed. The main difference between in the obtained spectra is associated with the position of the strongest band which depends on the Mo-N bond length. According to the obtained data, we can conclude that Raman line at 348 cm–1 in the experimental spectra of MoSi2N4, can have more complex explanation then just Γ-point Raman-active vibration as was discussed before in [Science, DOI: 10.1126/science.abb7023].

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Держатели документа:
Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, Moscow 119334, Russia
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center, KSC SB RAS, Krasnoyarsk 660036, Russia
School of Engineering and Construction, Siberian Federal University, Krasnoyarsk 660041, Russia
Moscow Institute of Physics and Technology, Institutsky lane 9, Dolgoprudny, Moscow region, Russia

Доп.точки доступа:
Sukhanova, E. V.; Popov, Z. I.; Орешонков, Александр Сергеевич
}
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Gavrichkov, V. A.
Superexchange in 2D perovskite HTSC with stripe nanostructure / V. A. Gavrichkov // International conference "Functional materials" : book of abstracts / ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P. 223-2224. - Библиогр.: 3 назв. - The reported study was supported by the grant RFFI 19-02-00034 and the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science according to the research project ”Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials No. 20-42-240016.

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Доп.точки доступа:
Berzhansky, V. N. \ed.\; Бержанский, Владимир Наумович; Ovchinnikov, S. G. \org. com.\; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович; "Functional materials", International conference(2021 ; Oct. 4-8 ; Alushta, Russia); Крымский федеральный университет имени В.И. Вернадского
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Effect of calcination temperature on activity of Fe2O3-Al2O3 nanocomposite catalysts in CO oxidation / A. M. Kremneva, A. V. Fedorov, O. A. Bulavchenko [et al.] // Catal. Lett. - 2020. - Vol. 150. - P. 3377-3385, DOI 10.1007/s10562-020-03250-8. - Cited References: 31. - This work was supported by the Russian Science Foundation (Grant No. 17-73-20157). The experiments were performed using facilities of the shared research center "National center of investigation of catalysts" at Boreskov Institute of Catalysis. The authors thank A.Yu. Gladky for the TPR measurements and Z.S. Vinokurov for the XRD measurements. . - ISSN 1011-372X. - ISSN 1572-879X

РУБ Chemistry, Physical
Рубрики:
MOSSBAUER
   SPECTROSCOPY
   CHEMISTRY
   IRON
   XPS
   ADSORPTION
   OXYGEN
   FE
Кл.слова (ненормированные):
Environmental catalysis -- Nanostructure -- Gasification -- Oxidation -- Mossbauer spectroscopy
Аннотация: Nanocomposite Fe–Al oxide catalysts were prepared by the melting of iron and aluminum nitrates with the subsequent calcination in air at different temperatures. It was found that the catalysts calcined at 450 °C are more active in the oxidation of CO than the catalysts calcined at 700 °C. X-ray diffraction and X-ray photoelectron spectroscopy showed that all the catalysts consist of hematite, α-Fe2O3 nanoparticles, and Al2O3 in an amorphous state. Iron oxide is the active component, which provides the oxidation of CO, while alumina is a texture promoter. The increase in the calcination temperature leads to a minor increase in the average size of hematite nanoparticles and an insignificant decrease in the specific surface area. Kinetic measurements showed that the oxidation of CO over the Fe–Al catalysts calcined at 450 and 700 °C proceeds with the activation energy of 61–69 and 91 kJ/mol, respectively. This means that the low-temperature and high-temperature catalysts contain different active species. Temperature-programmed reduction with CO indicated that the decrease in the calcination temperature improves the reducibility of the Fe-Al nanocomposites. According to 57Fe Mössbauer spectroscopy, the low-temperature catalysts contain hydrated iron oxides (acagenite and ferrihydrite) and a significant amount of highly defective hematite, which is absent in the high-temperature catalyst. These species can provide the enhanced activity of the low-temperature catalysts in the oxidation of CO.

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Держатели документа:
Boreskov Inst Catalysis, Novosibirsk 630090, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kremneva, A. M.; Fedorov, A. V.; Bulavchenko, O. A.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Saraev, A. A.; Yakovlev, V. A.; Kaichev, V. V.; Russian Science FoundationRussian Science Foundation (RSF) [17-73-20157]; National center of investigation of catalysts" at Boreskov Institute of Catalysis
}
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    Study of the Photovoltage in Mn/SiO2/n-Si MOS Structure at Cryogenic Temperatures / I. A. Bondarev [et al.] // Semiconductors. - 2019. - Vol. 53, Is. 14. - P. 88-92, DOI 10.1134/S1063782619140045. - Cited References: 27. - The work was supported by the Russian Foundation for Basic Research project no. 17-02-00302. . - ISSN 1063-7826. - ISSN 1090-6479
   Перевод заглавия: Исследование фотонапряжения в МДП структуре Mn/SiO2/n-Si при криогенных температурах
Рубрики:
NANOSTRUCTURE DEVICES
Кл.слова (ненормированные):
lateral photovoltage -- transverse photovoltage -- MOS structures -- low temperature -- space-charge region
Аннотация: Lateral photovoltaic effect in metal/insulator/semiconductor hybrid structures is a significant phenomenon for spintronics, as it establishes the interplay between the optical irradiation, electronic transport and spin-dependent properties of carriers. In present work we investigated photovoltaic phenomena in Mn/SiO2/n-Si MOS structure. The sample was prepared on a single-crystal n-Si (phosphorus-doped) substrate. The SiO2 layer with thickness of 1.5 nm was formed on the substrate surface by a chemical method. Manganese film with thickness of 15nm was deposited by thermal evaporation in ultrahigh vacuum in the “Angara” chamber. It was observed that at T < 45 K the values of lateral and transversal photovoltage nonmonotonically depend on the temperature and such dependences show complex behavior. Features of the photovoltage dependence on temperature, in the region above 20 K are explained by the change of carriers’ mobility and the competition between carriers’ drift velocity in the electric field of the space-charge region and their diffusion rate in the transverse and lateral directions. Below 20 K, the main contribution into the photovoltage is given by hot electrons injected from surface states levels to the conduction band. A strong magnetic field influence on the photovoltage below 20 K was observed. We associate it with the Lorenz force effect on the hot electrons, although we also don’t exclude the presence of mechanisms caused by spindependent scattering and recombination of hot electrons at occupied donor states.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036 Russia
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041 Russia

Доп.точки доступа:
Bondarev, I. A.; Бондарев, Илья Александрович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Yakovlev, I. A.; Яковлев, Иван Александрович; Volochaev, M. N.; Волочаев, Михаил Николаевич; Lukyanenko, A. V.; Лукьяненко, Анна Витальевна; Tarasov, A. S.; Тарасов, Антон Сергеевич; Volkov, N. V.; Волков, Никита Валентинович
}
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    Magnetoimpedance Effect in a SOI-Based Structure / D. A. Smolyakov [et al.] // Semiconductors. - 2019. - Vol. 53, Is. 14. - P. 98-100, DOI 10.1134/S1063782619140215. - Cited References: 10. - This study was supported by the Russian Foundation for Basic Research, project no. 18-32-00035. The work was partially supported by the Ministry of Education and Science of the Russian Federation and by Siberian Branch of the Russian Academy of Sciences (Project II.8.70) and Fundamental research program of the Presidium of the RAS no. 32 “Nanostructures: physics, chemistry, biology, basics of technologies”. . - ISSN 1063-7826. - ISSN 1090-6479
   Перевод заглавия: Эффект магнитоимпеданса в структуре на основе КНИ
Рубрики:
NANOSTRUCTURE DEVICES
Кл.слова (ненормированные):
magnetoimpedance -- spintronics -- silicone on insulator -- nanosized semiconductors -- interface states
Аннотация: This paper presents the results of the study the transport properties of the SOI-based structure. Measurements were carried out on an alternating current with an external magnetic field in a wide temperature range. The influence of the magnetic field was found. We associate this effect with the influence on the surface states located at the interface, this appears as a change of the energy of their levels. This effect is enhanced by the nanoscale of the silicon channel.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia
Siberian State University of Science and Technology, Krasnoyarsk, 660014 Russia

Доп.точки доступа:
Smolyakov, D. A.; Смоляков, Дмитрий Александрович; Tarasov, A. S.; Тарасов, Антон Сергеевич; Yakovlev, I. A.; Яковлев, Иван Александрович; Volochaev, M. N.; Волочаев, Михаил Николаевич
}
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Mechanochemical synthesis of hexagonal ferrites BaFe12O19 / V. Zhuravlev [et al.] // Key Eng. Mater. - 2018. - Vol. 781 KEM. - P. 119-124, DOI 10.4028/www.scientific.net/KEM.781.119. - Cited References: 15
Кл.слова (ненормированные):
Ferromagnetic resonance -- Magnetization curve -- Magnetocrystalline anisotropy -- Mechanochemical synthesis -- Nanostructure hexaferrites
Аннотация: The phase composition, structural parameters, and basic magnetic characteristics of BaFe12O19 hexaferrites prepared by the mechanochemical synthesis with subsequent annealing at a temperature of 1000°С and 1100°С for 1 h are investigated. The influence of the annealing temperature on the properties of synthesized materials is analyzed. Values of the saturation magnetization and the anisotropy field are determined. It is established that annealing temperature in the interval 1000 - 1100 °C does not significantly affect on the phase composition and the size of nanoparticles. The value of the anisotropy field increases substantially with increasing temperature.

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Держатели документа:
Tomsk State University, 36, Lenin Ave., Tomsk, 634050, Russian Federation
Tomsk Scientific Center SB RAS, 10/4, Academicheskii Pr., Tomsk, 634021, Russian Federation
L.V. Kirensky Institute of Physics SB RAS, 50, Academgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Zhuravlev, V.; Nevmyvaka, A.; Itin, V.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; International Conference on Radiation-Thermal Effects and Processes in Inorganic Materials(13th ; Tomsk)(9-14 October 2017)
}
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New method for calculations of nanostructure kinetic stability at high temperature / A. S. Fedorov [et al.] // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 167-170, DOI 10.1016/j.jmmm.2016.12.131. - Cited References:8. - The work was supported by the Russian Foundation for Basic Research Grant N15-02-06869A and by President of Russia Scientific School Program NSh 7559.2016.2. The authors would like to thank Joint Supercomputer Center of RAS, Moscow, for the access to the MVS 100K cluster and Institute of Computational Modelling of SB RAS, Krasnoyarsk, for providing the computational resources. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
AUGMENTED-WAVE METHOD
Кл.слова (ненормированные):
Kinetic stability -- Nanostructures -- Graphene nanoribbons
Аннотация: A new universal method is developed for determination of nanostructure kinetic stability (KS) at high temperatures, when nanostructures can be destroyed by chemical bonds breaking due to atom thermal vibrations. The method is based on calculation of probability for any bond in the structure to stretch more than a limit value L-max, when the bond breaks. Assuming the number of vibrations is very large and all of them are independent, using the central limit theorem, an expression for the probability of a given bond elongation up to L-max is derived in order to determine the KS. It is shown that this expression leads to the effective Arrhenius formula, but unlike the standard transition state theory it allows one to find the contributions of different vibrations to a chemical bond cleavage. To determine the KS, only calculation of frequencies and eigenvectors of vibrational modes in the groundstate of the nanostructure is needed, while the transition states need not be found. The suggested method was tested on calculating KS of bonds in some alkanes, octene isomers and narrow graphene nanoribbons of different types and widths at the temperature T=1200 K. The probability of breaking of the C-C bond in the center of these hydrocarbons is found to be significantly higher than at the ends of the molecules. It is also shown that the KS of the octene isomers decreases when the double C=C bond is moved to the end of the molecule, which agrees well with the experimental data. The KS of the narrowest graphene nanoribbons of different types varies by 1-2 orders of magnitude depending on the width and structure, while all of them are by several orders of magnitude less stable at high temperature than the hydrocarbons and benzene.

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Доп.точки доступа:
Fedorov, A. S.; Федоров, Александр Семенович; Kuzubov, A. A.; Visotin, M. A.; Tomilin, F. N.; Томилин, Феликс Николаевич; Russian Foundation for Basic Research [N15-02-06869A]; President of Russia Scientific School Program [NSh 7559.2016.2]; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
}
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Shevtsov, D. V.
An ultrahigh-vacuum multifunctional apparatus for synthesis and in situ investigation of low-dimensional structures by spectral magnetoellipsometry in the temperature range of 85–900 K / D. V. Shevtsov, S. A. Lyaschenko, S. N. Varnakov // Instrum. Exp. Tech. - 2017. - Vol. 60, Is. 5. - P. 759-763, DOI 10.1134/S0020441217050086. - Cited References: 19. - This study was supported by a Grant of the President of the Russian Federation for Support of Leading Schools (project no. NSh-7559.2016.2), by the Russian Foundation for Basic Research, the Government of Krasnoyarsk krai, and the Krasnoyarsk krai foundation for support of scientific and research and technical activity as a part of the scientific project no. 16-42-243058. . - ISSN 0020-4412
Кл.слова (ненормированные):
Semiconducting silicon -- Temperature distribution -- Ultrahigh vacuum -- Ellipsometric measurements -- In-situ investigations -- Low dimensional structure -- Metallic nanostructure -- Multifunctional apparatus -- Optical and magneto-optical properties -- Temperature dependence -- Temperature range -- Optical properties
Аннотация: This paper presents the results of modernizing an ultrahigh-vacuum multifunctional apparatus that allows one to obtain semiconductor or metallic nanostructures in a single technological cycle and to investigate their optical and magneto-optical properties in a temperature range of 85–900 K. The capabilities of the developed system were demonstrated based on the example of studying the temperature dependence of the bulk Si permittivity via spectral ellipsometric measurements. © 2017, Pleiades Publishing, Inc.

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Публикация на русском языке Шевцов, Дмитрий Валентинович. Сверхвысоковакуумная многофункциональная установка для синтеза низкоразмерных структур и их in situ исследований методом спектральной магнитоэллипсометрии в температурном диапазоне 85-900 K [Текст] / Д. В. Шевцов, С. А. Лященко, С. Н. Варнаков // Приборы и техн. эксперим. : Наука, 2017. - № 5. - С. 146-150

Держатели документа:
Kirenskiy Institute of Physics, Federal Research Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Reshetnev Siberial State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Lyashchenko, S. A.; Лященко, Сергей Александрович; Varnakov, S. N.; Варнаков, Сергей Николаевич; Шевцов, Дмитрий Валентинович
}
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10.

Three-dimensional model of quantum dots'' self-assembly under the action of laser radiation / V. A. Tkachenko [et al.] // Комп. оптика. - 2017. - Т. 41, № 4. - С. 577-580, DOI 10.18287/2412-6179-2017-41-4-577-580. - Библиогр.: 14. - The work was funded by the Russian Foundation for Basic Research (RFBR) and Krasnoyarsk Krai administration under research project No. 16-42-240410r_a, RFBR research project No. 16-32-00129 and by the Ministry of Education and Science of the Russian Federation (Grant 3.6341.2017/VU). . - ISSN 0134-2452
Кл.слова (ненормированные):
Nanostructure fabrication -- Plasmonics -- Optical tweezers or optical manipulation
Аннотация: This study considered a process of quantum dots' self-assembly into nanostructure arrays with predefined geometry, which proceeds in the external resonant laser field. We considered the simplest case of assembling a stable structure of two particles. The problem was solved numerically using a three-dimensional model of Brownian dynamics. The idea of the method is that the attraction of the dots occurs due to the interaction of resonantly induced dipole moments, with the dots being then captured by the Van der Waals force. Finally, a three-dimensional model was considered; the average nanoparticle aggregation time as a function of the laser radiation wavelength was calculated; the probability of such structures' being formed was estimated for the calculated average aggregation time and for the laser pulse duration used in the experiment. The wavelength of the maximum probability was found to be shifted from the single particle resonance wavelength of 525 nm to the red area of 535 nm, which is in qualitative agreement with the redshift of the resonance wavelength of interacting particles.

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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences
Siberian Federal University

Доп.точки доступа:
Tkachenko, V. A.; Tsipotan, A. S.; Slabko, V. V.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич
}
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